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Q: 

Possible causes of black(iphone-touch) screen on(after) launch?

I have a simpe window based application that loads a series of images on launch. Only one nib(MainWindow.xib) with a UIView and UIToolbar.

It WAS working, both in the simulator and external device.

I had some SDK issues for a while(I had removed needed SDK's) but it is now compiling again without errors and I see the launch image correctly.

BUT, after launching all I see now is a black screen!

I've done some searching and have read that this could be due to missing plist or nib file in my project, but they are both there. I don't know what steps to take next to debug.
Can anyone who has expereinced this tell me what the possible causes might be?

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